USB-SPI: Make global initializer names more unique
USB-SPI: Make global initializer names more unique

Previously it was relatively easy to collide with these
names in user code, adding the _ suffix makes that much
less likely.

Signed-off-by: Anton Staaf <84531b4b964c017023781514a6665b71e84b32bc@chromium.org>

BRANCH=None
BUG=None
TEST=make buildall -j

Change-Id: I997e1bc81aab4ca0b16e011bf5ff66444320c4f1
Reviewed-on: https://chromium-review.googlesource.com/232731
Tested-by: Anton Staaf <84531b4b964c017023781514a6665b71e84b32bc@chromium.org>
Reviewed-by: Vincent Palatin <70a9964ec8fd10b0b08fcc8623c2add25ddf99ac@chromium.org>
Commit-Queue: Anton Staaf <84531b4b964c017023781514a6665b71e84b32bc@chromium.org>

coreboot/chrome-ec,fourier49/BIZ_EC,akappy7/ChromeOS_EC_LED_Diagnostics,md5555/ec,md5555/ec,akappy7/ChromeOS_EC_LED_Diagnostics,eatbyte/chromium-ec,fourier49/BIZ_EC,md5555/ec,mtk09422/chromiumos-platform-ec,coreboot/chrome-ec,eatbyte/chromium-ec,eatbyte/chromium-ec,akappy7/ChromeOS_EC_LED_Diagnostics,mtk09422/chromiumos-platform-ec,coreboot/chrome-ec,mtk09422/chromiumos-platform-ec,fourier49/BIZ_EC,mtk09422/chromiumos-platform-ec,fourier49/BIZ_EC,fourier49/BZ_DEV_EC,fourier49/BZ_DEV_EC,eatbyte/chromium-ec,coreboot/chrome-ec,coreboot/chrome-ec,fourier49/BZ_DEV_EC,akappy7/ChromeOS_EC_LED_Diagnostics,fourier49/BZ_DEV_EC,coreboot/chrome-ec,akappy7/ChromeOS_EC_LED_Diagnostics,md5555/ec