Using calculate_bit_shift() to replace _rtl92s_phy_calculate_bit_shift().
And fix the undefined bitwise shift behavior problem.

Fixes: d1585316 ("rtlwifi: rtl8192se: Merge phy routines")
Signed-off-by: Su Hui <suhui@nfschina.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20231219065739.1895666-10-suhui@nfschina.com