riscv: Kconfig: Style cleanups

The majority of the Kconfig files use a single tab for basic indentation
and a single tab followed by two whitespaces for help text indentation.
Fix the lines that don't follow this convention.

While at it, add trailing comments to endif/endmenu statements for
better readability.

* 'riscv-kconfig_cleanups' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/palmer/linux:
  riscv: Kconfig.socs: Add comments
  riscv: Kconfig.erratas: Add comments
  riscv: Kconfig: Fix indentation and add comments

arch/riscv/Kconfig

@@ -385,7 +385,7 @@ config FPU
 
 	  If you don't know what to do here, say Y.
 
-endmenu
+endmenu # "Platform type"
 
 menu "Kernel features"
 
@@ -474,7 +474,7 @@ config COMPAT
 
 	  If you want to execute 32-bit userspace applications, say Y.
 
-endmenu
+endmenu # "Kernel features"
 
 menu "Boot options"
 
@@ -510,7 +510,6 @@ config CMDLINE_EXTEND
 	  cases where the provided arguments are insufficient and
 	  you don't want to or cannot modify them.
 
-
 config CMDLINE_FORCE
 	bool "Always use the default kernel command string"
 	help
@@ -602,7 +601,7 @@ config XIP_PHYS_ADDR
 	  be linked for and stored to.  This address is dependent on your
 	  own flash usage.
 
-endmenu
+endmenu # "Boot options"
 
 config BUILTIN_DTB
 	bool
@@ -613,12 +612,12 @@ menu "Power management options"
 
 source "kernel/power/Kconfig"
 
-endmenu
+endmenu # "Power management options"
 
 menu "CPU Power Management"
 
 source "drivers/cpuidle/Kconfig"
 
-endmenu
+endmenu # "CPU Power Management"
 
 source "arch/riscv/kvm/Kconfig"

arch/riscv/Kconfig.erratas

@@ -55,4 +55,4 @@ config ERRATA_THEAD_PBMT
 
 	  If you don't know what to do here, say "Y".
 
-endmenu
+endmenu # "CPU errata selection"

arch/riscv/Kconfig.socs

@@ -78,6 +78,6 @@ config SOC_CANAAN_K210_DTB_SOURCE
 	  for the DTS file that will be used to produce the DTB linked into the
 	  kernel.
 
-endif
+endif # SOC_CANAAN
 
-endmenu
+endmenu # "SoC selection"