The functions msdc_eirq_cd and msdc_eirq_sdio are defined but never
used, so they are removed. This also fixes two compiler warnings:
drivers/staging/mt7621-mmc/sd.c:517:13: warning: ‘msdc_eirq_cd’ defined but
not used [-Wunused-function]
static void msdc_eirq_cd(void *data)
^~~~~~~~~~~~
drivers/staging/mt7621-mmc/sd.c:507:13: warning: ‘msdc_eirq_sdio’ defined but
not used [-Wunused-function]
static void msdc_eirq_sdio(void *data)