fruitpie: restore PD_TX_EN GPIO on exit from debug mode
fruitpie: restore PD_TX_EN GPIO on exit from debug mode

this fixes the previous patch to correctly restore the GPIO

BRANCH=none
BUG=none
TEST=verify that GPIO state after restore matches default

Change-Id: I42f73d21399f5e9429dfb50aacb6aba59ba33315
Signed-off-by: Dominic Chen <b387460b8fd8c62e0d086b47d9ccc7f5576369eb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/206905
Reviewed-by: Vincent Palatin <70a9964ec8fd10b0b08fcc8623c2add25ddf99ac@chromium.org>

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