nyan: wait 225ms for PMIC RTC start-up
nyan: wait 225ms for PMIC RTC start-up

The first time the PMIC sees power (AC or battery) it needs 200ms
(+/-12% oscillator tolerance) for the RTC startup. In addition
there is a startup time of approx. 0.5msec until V2_5 regulator
starts up.

BUG=None
BRANCH=nyan
TEST=verified on rev 3.12 with AC/battery replug * 10.
Power button on/off and 'power on/off' are not effected.

Change-Id: I706829017a53c549601a925cb18d33b21c50eb76
Signed-off-by: Louis Yung-Chieh Lo <2d80bee8408e64f859a1b5868bd3b311c0a4b4cd@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/180677
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>

fourier49/BZ_DEV_EC,coreboot/chrome-ec,fourier49/BZ_DEV_EC,longsleep/ec,md5555/ec,akappy7/ChromeOS_EC_LED_Diagnostics,md5555/ec,eatbyte/chromium-ec,gelraen/cros-ec,fourier49/BIZ_EC,gelraen/cros-ec,longsleep/ec,alterapraxisptyltd/chromium-ec,eatbyte/chromium-ec,fourier49/BIZ_EC,fourier49/BIZ_EC,thehobn/ec,mtk09422/chromiumos-platform-ec,mtk09422/chromiumos-platform-ec,eatbyte/chromium-ec,alterapraxisptyltd/chromium-ec,coreboot/chrome-ec,md5555/ec,coreboot/chrome-ec,thehobn/ec,akappy7/ChromeOS_EC_LED_Diagnostics,longsleep/ec,alterapraxisptyltd/chromium-ec,thehobn/ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,gelraen/cros-ec,longsleep/ec,thehobn/ec,fourier49/BZ_DEV_EC,akappy7/ChromeOS_EC_LED_Diagnostics,alterapraxisptyltd/chromium-ec,mtk09422/chromiumos-platform-ec,akappy7/ChromeOS_EC_LED_Diagnostics,md5555/ec,fourier49/BIZ_EC,akappy7/ChromeOS_EC_LED_Diagnostics,fourier49/BZ_DEV_EC,eatbyte/chromium-ec,gelraen/cros-ec,mtk09422/chromiumos-platform-ec