gbm: Rename verbosely named functions
gbm: Rename verbosely named functions

Remove 'platform' from the following function names:
    gbm_platform_dl_can_open
    gbm_platform_dl_sym

Signed-off-by: Chad Versace <a557f7f75bf28dc19ac99107f5cc7cd6b3fbdb1a@linux.intel.com>

janesma/waffle,waffle-gl/waffle,yinquan529/waffle-gl-waffle,chadversary/waffle,maurossi/waffle,waffle-gl/waffle,fjhenigman/waffle,evelikov/waffle,waffle-gl/waffle,janesma/waffle,maurossi/waffle,janesma/waffle,yinquan529/waffle-gl-waffle,maurossi/waffle,yinquan529/waffle-gl-waffle,waffle-gl/waffle,chadversary/waffle,evelikov/waffle,dcbaker/waffle,fjhenigman/waffle,evelikov/waffle,chadversary/waffle,dcbaker/waffle,dcbaker/waffle,fjhenigman/waffle