ENGR00230538-1: CAAM: Correct shifting offset for CAAM IPG clock selection

ENGR00230538-1: CAAM: Correct shifting offset for CAAM IPG clock selection

3 pairs of clock enable bits are required for CAAM clocking:
(1) wrapper IPG clock
(2) wrapper ACLK
(3) secure memory clock

IPG enable happened to be using an incorrect shift selection, which
had the net effect of leaving secure memory unclocked. Added the correct
shift selection in so that all 3 clock enable pairs are turned on.

Signed-off-by: Steve Cornelius <steve.cornelius@freescale.com>
Signed-off-by: Terry Lv <r65388@freescale.com>