Staging: rts5139: sd_cprm: fix coding style and deprecation issues

This commit fixes coding style and deprecation issues which
includes long lines, braces with single statments in if condition
and deprecated min() function.

Signed-off-by: Adnan Ali <adnan.ali@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>