egl/android: Fix build break with dri2_initialize_android _EGLDisplay parameter

egl/android: Fix build break with dri2_initialize_android _EGLDisplay parameter

Commit 2f421651aca9 ("egl: let each platform decided how to handle
LIBGL_ALWAYS_SOFTWARE") broke the build due to copy-n-paste of misnamed
function parameter.:

src/egl/drivers/dri2/platform_android.c:1183:8: error: use of undeclared identifier 'disp'

Rather than just fixing 'disp', rename the function parameter 'dpy' to
'disp' to align with the other EGL platforms' implementations.

Fixes: 2f421651aca9 ("egl: let each platform decided how to handle LIBGL_ALWAYS_SOFTWARE")
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Acked-by: Eric Engestrom <eric.engestrom@imgtec.com>
Signed-off-by: Rob Herring <robh@kernel.org>