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/m_can/Kconfig

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 config CAN_M_CAN
 	tristate "Bosch M_CAN support"
-	---help---
+	help
 	  Say Y here if you want support for Bosch M_CAN controller framework.
 	  This is common support for devices that embed the Bosch M_CAN IP.
 
@@ -9,7 +9,7 @@ config CAN_M_CAN_PLATFORM
 	tristate "Bosch M_CAN support for io-mapped devices"
 	depends on HAS_IOMEM
 	depends on CAN_M_CAN
-	---help---
+	help
 	  Say Y here if you want support for IO Mapped Bosch M_CAN controller.
 	  This support is for devices that have the Bosch M_CAN controller
 	  IP embedded into the device and the IP is IO Mapped to the processor.
@@ -18,7 +18,7 @@ config CAN_M_CAN_TCAN4X5X
 	depends on CAN_M_CAN
 	depends on REGMAP_SPI
 	tristate "TCAN4X5X M_CAN device"
-	---help---
+	help
 	  Say Y here if you want support for Texas Instruments TCAN4x5x
 	  M_CAN controller.  This device is a peripherial device that uses the
 	  SPI bus for communication.