cros_bundle_firmware: Add support for exynos memory frequency
cros_bundle_firmware: Add support for exynos memory frequency

Support the 'f' machine parameter so that the memory frequency can be
controlled from the fdt.

BUG=chromium-os:31121
BRANCH=none
TEST=manual
Change memory controller node in U-Boot's cros5250-common.dts to use a
clock-frequency of 533MHz instead of 800MHz.

	dmc@10C00000 {
		mem-interleave-size = <0x1f>;
		mem-type = "ddr3";
		clock-frequency = <533000000>;
		arm-frequency = <1700000000>;
	};

boot on snow with the SPL code manually changed to print the speed, and see
that it is 533MHz. Unfortunately the normal boot message gives a warning:

U-Boot 2011.12-02475-g0e7346a-dirty (Sep 14 2012 - 11:31:21) for SMDK5250

CPU:   S5PC520 @ 1700MHz
I2C:   ready
DRAM:  2 GiB Elpida DDR3 @ 800MHz (Warning: 533MHz requested)
MMC:   S5P MSHC0: 0, S5P MSHC1: 1
Using default environment

Change-Id: Ifbc5e2598c1987eac7903a22aa43a14b241a5e51
Signed-off-by: Simon Glass <c00b0378376498bd9cd974c388df8854c0131d27@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/33336
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>

mgireesh05/dev-util,marineam/coreos-dev-util,coreos/dev-util,mgireesh05/dev-util,coreos/dev-util,coreos/dev-util,mgireesh05/dev-util,marineam/coreos-dev-util