drivers/mmc/fsl_esdhc.c: sparse fixes

fsl_esdhc.c:71:6: warning: symbol 'esdhc_xfertyp' was not declared. Should it be static?
fsl_esdhc.c:413:6: warning: symbol 'set_sysctl' was not declared. Should it be st

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>