treewide: replace '---help---' in Kconfig files with 'help'

Since commit 84af7a6194 ("checkpatch: kconfig: prefer 'help' over
'---help---'"), the number of '---help---' has been gradually
decreasing, but there are still more than 2400 instances.

This commit finishes the conversion. While I touched the lines,
I also fixed the indentation.

There are a variety of indentation styles found.

  a) 4 spaces + '---help---'
  b) 7 spaces + '---help---'
  c) 8 spaces + '---help---'
  d) 1 space + 1 tab + '---help---'
  e) 1 tab + '---help---'    (correct indentation)
  f) 1 tab + 1 space + '---help---'
  g) 1 tab + 2 spaces + '---help---'

In order to convert all of them to 1 tab + 'help', I ran the
following commend:

  $ find . -name 'Kconfig*' | xargs sed -i 's/^[[:space:]]*---help---/\thelp/'

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

drivers/net/can/cc770/Kconfig

@@ -7,14 +7,14 @@ if CAN_CC770
 
 config CAN_CC770_ISA
 	tristate "ISA Bus based legacy CC770 driver"
-	---help---
+	help
 	  This driver adds legacy support for CC770 and AN82527 chips
 	  connected to the ISA bus using I/O port, memory mapped or
 	  indirect access.
 
 config CAN_CC770_PLATFORM
 	tristate "Generic Platform Bus based CC770 driver"
-	---help---
+	help
 	  This driver adds support for the CC770 and AN82527 chips
 	  connected to the "platform bus" (Linux abstraction for directly
 	  to the processor attached devices).