powerpc/ep1a: Fix warnings
libbsp/powerpc/shared: Fix warnings
libbsp/shared/vmeUniverse: Fix warnings
libcpu/powerpc/mpc6xx/timer/timer.c: Fix warnings
powerpc/score603e/irq/irq_init.c: Clean up
mips/clock/ckinit.c: Clean up (may be unused)
Remove libcpu/mips/clock - unused code

This code was only referenced for r46xx CPU models. There are
no BSPs currently in the tree with this CPU model. The r46xx
was the original target for the MIPS port and it is likely that
the code has not been used on actual hardware in many years.

All MIPS BSPs successfully built after this was removed.
powerpc bootloader: Remove warnings

This code is shared by multiple PowerPC BSPs including all
motorola_powerpc variants.
shell/main_cp.c: Delete unused -rtems_shell_cp_exit()
libmisc/redirector/stdio-redirect.c: Use sleep not usleep and do not overflow 16-bit int
arm/csb337/startup/bspreset.c: Include <bsp/bootcard.h>
arm/edb7312/startup/bspreset.c: Include <bsp/bootcard.h>
arm/gba/startup/bspreset.c: Include <bsp/bootcard.h>
arm/gp32/startup/bspreset.c: Include <bsp/bootcard.h>
arm/gumstix/startup/bspreset.c: Include <bsp/bootcard.h>
arm/rtl22xx/startup/bspreset.c: Include <bsp/bootcard.h>
arm/smdk2410/startup/bspreset.c: Include <bsp/bootcard.h>
mips/csb350/startup/bspreset.c: Include <bsp/bootcard.h>
mips/malta/startup/bspreset.c: Include <bsp/bootcard.h>
powerpc/motorola_powerpc/startup/bspreset.c: Include <bsp/bootcard.h>