Revert "riscv: Add tests for riscv module loading"

This reverts commit af71bc1.

Author: esmil

arch/riscv/Kconfig.debug

@@ -1 +0,0 @@
-source "arch/riscv/kernel/tests/Kconfig.debug"

arch/riscv/kernel/Makefile

@@ -57,7 +57,6 @@ obj-y	+= stacktrace.o
 obj-y	+= cacheinfo.o
 obj-y	+= patch.o
 obj-y	+= probes/
-obj-y	+= tests/
 obj-$(CONFIG_MMU) += vdso.o vdso/
 
 obj-$(CONFIG_RISCV_MISALIGNED)	+= traps_misaligned.o