[eglfs] Set swapInterval at the right time

The swapInterval applies to the current context and cannot be set
before.
Use HWC_NUM_DISPLY_TYPES for 1.3 as number of displays

Some Android hwcomposer implementations expect all displays being initialized even if not
used.

Signed-off-by: Simon Busch <morphis@gravedo.de>
Add support for changes in API version 1.3

Signed-off-by: Simon Busch <morphis@gravedo.de>