Improve performance of OS_DebugPrintf

[skliper]

Is your feature request related to a problem? Please describe.
OS_DebugPrintf checks the level and doesn't do the work, but the caller still sets up the variable arguments. It's better to have a table of function pointers that change when the level changes to either the debug printf or a no-op.

osal/src/os/shared/inc/os-shared-globaldefs.h

Lines 83 to 87 in ead5723

	extern void OS_DebugPrintf(uint32 Level, const char *Func, uint32 Line, const char *Format, ...);
	/* Debug printfs are compiled in, but also can be disabled by a run-time flag.
	* Note that the ##__VA_ARGS__ syntax works on GCC but might need tweaks for other compilers... */
	#define OS_DEBUG_LEV(l, ...) OS_DebugPrintf(l, __func__, __LINE__, __VA_ARGS__);
	#define OS_DEBUG(...) OS_DEBUG_LEV(1, __VA_ARGS__)

Describe the solution you'd like
Table of function pointers

Describe alternatives you've considered
Leave as-is (future work), this is debug code which wouldn't typically be included in production

Additional context
None

Requester Info
Jacob Hageman - NASA/GSFC, OSAL code review