Generated reference images for 420dpi and xxhdpi

Previous reference images must have been generated with a device
that has the wrong PRODUCT_AAPT_PREF_CONF set. For bullhead, the
dpi is 420 but PRODUCT_AAPT_PREF_CONFIG is set to xxhdpi when it
should actually be set to 420dpi. These new reference images were
generated with matching PRODUCT_AAPT_PREF_CONFIGs -- bullhead at
420dpi and Razer Phone at 480dpi.

Tested CtsThemeHostTestCases on:
* Bullhead (420dpi)
* Pixel 2 (420dpi)
* Razer Phone (480dpi)

Change-Id: I603f368d5707d0b03b38634b564344afc506de1e
2 files changed