Revert "linux-firmware: add WiFi firmware for Imagination UCCP420 RPU" This patch effectively reverts CL:246070, which added the WiFi MAC and PHY firmware for the Ensigma UCCP420 RPU from Imagination Techologies. BUG=chromium:476223 CQ-DEPEND=CL:266153 TEST=`emerge-$BOARD linux-firmware` Change-Id: I7ca5c50e0f395e00f3a7a75a374edb726e2b0bb9 Reviewed-on: https://chromium-review.googlesource.com/266126 Tested-by: Ben Chan <[email protected]> Reviewed-by: Mike Frysinger <[email protected]> Commit-Queue: Ben Chan <[email protected]>