clk:mmp:clk-of-pxa910: Free memory and Unmap region obtained by kzmalloc and of_iomap

Free memory and memory mapping , if pxa910_clk_init is not successful.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>