ANDROID: GKI: Update the pixel symbol list

These symbols are part of supporting Pixel devices on GKI kernels.

1 function symbol(s) added
  'struct gpio_desc* devm_gpiod_get_index_optional(struct device*, const char*,
       unsigned int, enum gpiod_flags)'

Bug: 279090118
Change-Id: I1bb36d65f928fac53e0a3dbdc2c0559349d5fc42
Signed-off-by: Will McVicker <willmcvicker@google.com>