instead of overwriting Reset settings, let's read-modify-write RCC registers. Change-Id: I21b7e26e6007d3c3d73803c681c980c6947f5910 Signed-off-by: Felipe Balbi <balbi@kernel.org> Reviewed-on: http://openocd.zylin.com/3601 Tested-by: jenkins Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>