MAINTAINERS: Update SiFive driver maintainers

Add myself as a maintainer for the various SiFive drivers, since I have
been performing cleanup activity on these drivers and reviewing patches
to them for a while now. Remove Palmer as a maintainer, as he is focused
on overall RISC-V architecture support.

Collapse some duplicate entries into the main SiFive drivers entry:
 - Conor is already maintainer of standalone cache drivers as a whole,
   and these files are also covered by the "sifive" file name regex.
 - Paul's git tree has not been updated since 2018, and all file names
   matching the "fu540" pattern also match the "sifive" pattern.
 - Green has not been active on the LKML for a couple of years.

Signed-off-by: Samuel Holland <[email protected]>
Acked-by: Paul Walmsley <[email protected]>
Acked-by: Conor Dooley <[email protected]>
Acked-by: Palmer Dabbelt <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

Author: SiFiveHolland

MAINTAINERS

@@ -1395,6 +1395,7 @@ F:	drivers/hwmon/max31760.c
 
 ANALOGBITS PLL LIBRARIES
 M:	Paul Walmsley <[email protected]>
+M:	Samuel Holland <[email protected]>
 S:	Supported
 F:	drivers/clk/analogbits/*
 F:	include/linux/clk/analogbits*
@@ -16720,6 +16721,7 @@ F:	drivers/pci/controller/dwc/*layerscape*
 PCI DRIVER FOR FU740
 M:	Paul Walmsley <[email protected]>
 M:	Greentime Hu <[email protected]>
+M:	Samuel Holland <[email protected]>
 L:	[email protected]
 S:	Maintained
 F:	Documentation/devicetree/bindings/pci/sifive,fu740-pcie.yaml
@@ -19965,36 +19967,15 @@ S:	Maintained
 F:	drivers/watchdog/simatic-ipc-wdt.c
 
 SIFIVE DRIVERS
-M:	Palmer Dabbelt <[email protected]>
 M:	Paul Walmsley <[email protected]>
+M:	Samuel Holland <[email protected]>
 L:	[email protected]
 S:	Supported
+F:	drivers/dma/sf-pdma/
 N:	sifive
+K:	fu[57]40
 K:	[^@]sifive
 
-SIFIVE CACHE DRIVER
-M:	Conor Dooley <[email protected]>
-L:	[email protected]
-S:	Maintained
-F:	Documentation/devicetree/bindings/cache/sifive,ccache0.yaml
-F:	drivers/cache/sifive_ccache.c
-
-SIFIVE FU540 SYSTEM-ON-CHIP
-M:	Paul Walmsley <[email protected]>
-M:	Palmer Dabbelt <[email protected]>
-L:	[email protected]
-S:	Supported
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/pjw/sifive.git
-N:	fu540
-K:	fu540
-
-SIFIVE PDMA DRIVER
-M:	Green Wan <[email protected]>
-S:	Maintained
-F:	Documentation/devicetree/bindings/dma/sifive,fu540-c000-pdma.yaml
-F:	drivers/dma/sf-pdma/
-
-
 SILEAD TOUCHSCREEN DRIVER
 M:	Hans de Goede <[email protected]>
 L:	[email protected]