[ARM] 4080/1: Fix for the SSCR0_SlotsPerFrm macro

The SSCR0_SlotsPerFrm macro writes a 3-bit value to bits [2:0], while the correct location of FRDC in SSCR0 is at bits [26:24]. This patch adds the missing "<< 24".

Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>