misc: rtsx: Improve compatibility for rts5261

Change initial clock to improve compatibility for rts5261

Signed-off-by: Rui Feng <rui_feng@realsil.com.cn>
Link: https://lore.kernel.org/r/1586918237-3016-1-git-send-email-rui_feng@realsil.com.cn


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>