global: Remove leading/trailing blank lines in files

Remove leading/trailing blank lines in .c, .h, .py, .rst, .yml, and
.yaml files.

Will avoid failures with the new CI test in
https://github.com/zephyrproject-rtos/ci-tools/pull/112, though it only
checks changed files.

Move the 'target-notes' target in boards/xtensa/odroid_go/doc/index.rst
to get rid of the trailing blank line there. It was probably misplaced.

Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>

include/arch/nios2/linker.ld

@@ -299,4 +299,3 @@ SECTIONS
 #include <linker/debug-sections.ld>
 
     }
-

include/arch/nios2/thread.h

@@ -62,4 +62,3 @@ typedef struct _thread_arch _thread_arch_t;
 #endif /* _ASMLANGUAGE */
 
 #endif /* ZEPHYR_INCLUDE_ARCH_NIOS2_THREAD_H_ */
-

include/arch/xtensa/thread.h

@@ -113,4 +113,3 @@ typedef struct _thread_arch _thread_arch_t;
 #endif /* _ASMLANGUAGE */
 
 #endif /* ZEPHYR_INCLUDE_ARCH_XTENSA_THREAD_H_ */
-

include/arch/xtensa/xtensa_api.h

@@ -65,4 +65,3 @@ static inline void _xt_set_intclear(unsigned int arg)
 }
 
 #endif /* ZEPHYR_ARCH_XTENSA_INCLUDE_XTENSA_API_H_ */
-

include/arch/xtensa/xtensa_timer.h

@@ -153,4 +153,3 @@ extern void z_xt_tick_divisor_init(void);
 #endif // Internal/External timer
 
 #endif  /* ZEPHYR_ARCH_XTENSA_INCLUDE_XTENSA_TIMER_H_ */
-