mfd: sun6i-prcm: Update Kconfig description

This driver is used by a specific range of SoCs between when the PRCM
hardware was introduced (A31) and when the PRCM CCU driver was added
(A83T). It is unlikely to be extended to additional hardware. Update
the description to include the full list of applicable SoCs.
Signed-off-by: NSamuel Holland <samuel@sholland.org>
Reviewed-by: NJernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: NLee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20220702184044.51144-1-samuel@sholland.org

drivers/mfd/Kconfig

@@ -1358,12 +1358,13 @@ config MFD_STA2X11
 	select REGMAP_MMIO
 
 config MFD_SUN6I_PRCM
-	bool "Allwinner A31 PRCM controller"
+	bool "Allwinner A31/A23/A33 PRCM controller"
 	depends on ARCH_SUNXI || COMPILE_TEST
 	select MFD_CORE
 	help
 	  Support for the PRCM (Power/Reset/Clock Management) unit available
-	  in A31 SoC.
+	  in the A31, A23, and A33 SoCs. Other Allwinner SoCs contain similar
+	  hardware, but they do not use this driver.
 
 config MFD_SYSCON
 	bool "System Controller Register R/W Based on Regmap"