clk: samsung: exynos5420: update clocks for FSYS and FSYS2 blocks

This patch adds more clocks from FSYS and FSYS2 blocks
and uses GATE_IP_* registers for gating IPs.

Signed-off-by: Rahul Sharma <rahul.sharma@samsung.com>
Signed-off-by: Shaik Ameer Basha <shaik.ameer@samsung.com>
Signed-off-by: Tomasz Figa <t.figa@samsung.com>