kbuild: arm: Do not define "comma" twice

The definition of "comma" exists in scripts/Kbuild.include.
We should not double it.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Michal Marek <mmarek@suse.cz>
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 0ce9d0f..8568b6fb 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -50,8 +50,6 @@
 LD		+= -EL
 endif
 
-comma = ,
-
 # This selects which instruction set is used.
 # Note that GCC does not numerically define an architecture version
 # macro, but instead defines a whole series of macros which makes
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index 5783354..ebd0659 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -30,8 +30,6 @@
 LD		+= -EL
 endif
 
-comma = ,
-
 CHECKFLAGS	+= -D__aarch64__
 
 # Default value