staging: rtl8723bs: remove set but not used variable 'pHalData', 'pdmpriv'

staging: rtl8723bs: remove set but not used variable 'pHalData', 'pdmpriv'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/staging/rtl8723bs/hal/rtl8723b_hal_init.c: In function rtl8723b_InitAntenna_Selection:
drivers/staging/rtl8723bs/hal/rtl8723b_hal_init.c:2237:23: warning: variable pHalData set but not used [-Wunused-but-set-variable]
drivers/staging/rtl8723bs/hal/rtl8723b_hal_init.c: In function rtl8723b_fill_default_txdesc:
drivers/staging/rtl8723bs/hal/rtl8723b_hal_init.c:3056:18: warning: variable pdmpriv set but not used [-Wunused-but-set-variable]

They are introduced by commit 554c0a3abf21 ("staging:
Add rtl8723bs sdio wifi driver"), but never used, so remove them.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: zhengbin <zhengbin13@huawei.com>
Link: https://lore.kernel.org/r/1574063156-68155-3-git-send-email-zhengbin13@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>