Ensure all source code end with one and only one newline

by this command:
git ls-files -z | while IFS= read -rd '' f; do tail -c1 < "$f" | read -r _ || echo >> "$f"; done

arch/misoc/include/arch.h

@@ -0,0 +1 @@
+

arch/misoc/src/lm32/Make.defs

@@ -51,4 +51,4 @@ CHIP_CSRCS += lm32_initialize.c lm32_initialstate.c lm32_interruptcontext.c
 CHIP_CSRCS += lm32_irq.c lm32_releasepending.c lm32_releasestack.c
 CHIP_CSRCS += lm32_stackframe.c lm32_swint.c lm32_unblocktask.c
 CHIP_CSRCS += lm32_reprioritizertr.c lm32_schedulesigaction.c lm32_sigdeliver.c
-CHIP_CSRCS += lm32_flushcache.c
+CHIP_CSRCS += lm32_flushcache.c