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In order to improve the performance of sysjump, the CL increases the clock freq of ec to 50M HZ (The maximum freq rate for SPI flash.). Once ec jumps into the other region successfully, the clock freq is restored to the default value (15MHz) in main routine. Modified sources: 1. clock.c: Add clock_turbo for speed up clock's freq to max. 2. clock_chip.h: The declarartion for clock_turbo. 3. system.c: Speed up clock rate before downloading FW. BRANCH=none BUG=chrome-os-partner:34346 TEST=make BOARD=npcx_evb; test nuvoton IC specific drivers Change-Id: I996e35fff336e6292599497feb1ee6c2f95becba Signed-off-by: Mulin Chao <mlchao@nuvoton.com> Reviewed-on: https://chromium-review.googlesource.com/381799 Reviewed-by: Aaron Durbin <adurbin@chromium.org>