staging: rtl8188eu: Rework function writeOFDMPowerReg88E()

Rename CamelCase variables and function name.
Remove a block of the code which is executed only if RF type is T2R2 but
rtl8188eu's RF is a T1R1 type, so driver doesn't need that code.

Signed-off-by: navin patidar <navin.patidar@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>