ARM: 7131/1: clkdev: Add Common Macro for clk_lookup

Added a standardized macro CLKDEV_INIT which can used across all
the platforms to support clkdev

Suggested-by: Russell King <rmk+kernel@arm.linux.org.uk>

Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Padmavathi Venna <padma.v@samsung.com>
Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>