Makefile: Avoid resetting link flags in config.mk

This makes it impossible to change them elsewhere. The default value is
'empty' anyway, so just drop it.

Signed-off-by: Simon Glass <[email protected]>

Author: sjg20

config.mk

@@ -12,7 +12,6 @@
 #  If we did not have Tegra SoCs, build system would be much simpler...)
 PLATFORM_RELFLAGS :=
 PLATFORM_CPPFLAGS :=
-KBUILD_LDFLAGS :=
 LDFLAGS_FINAL :=
 LDFLAGS_STANDALONE :=
 OBJCOPYFLAGS :=