Revert "init/Kconfig: Fix infinite Kconfig recursion on PPC"

This reverts commit 71c67a31f09fa8fdd1495dffd96a5f0d4cef2ede.

Commit 117acf5c29dd ("powerpc/Makefile: Always pass --synthetic to nm if
supported") removed the only conditional definition of $(NM), so we can
revert our temporary bodge to avoid Kconfig recursion and go back to
passing $(NM) through to the 'tools-support-relr.sh' when detecting
support for RELR relocations.

Signed-off-by: Will Deacon <will@kernel.org>
diff --git a/init/Kconfig b/init/Kconfig
index 8b4596e..d96127e 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -31,7 +31,7 @@
 	def_bool $(success,$(srctree)/scripts/gcc-goto.sh $(CC))
 
 config TOOLS_SUPPORT_RELR
-	def_bool $(success,env "CC=$(CC)" "LD=$(LD)" "OBJCOPY=$(OBJCOPY)" $(srctree)/scripts/tools-support-relr.sh)
+	def_bool $(success,env "CC=$(CC)" "LD=$(LD)" "NM=$(NM)" "OBJCOPY=$(OBJCOPY)" $(srctree)/scripts/tools-support-relr.sh)
 
 config CC_HAS_WARN_MAYBE_UNINITIALIZED
 	def_bool $(cc-option,-Wmaybe-uninitialized)