ARC: bitops: Remove unecessary operation and value

The 1-bit shift rotation to the left on x variable located on
4   last if statement can be removed because the computed value is will
not be used afront.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>