fix lost old callback when continuous call requestRenderAndNotify

If continuous call requestRenderAndNotify before trigger old
callback, old callback will lose, cause VRI will wait for SV's
draw to finish forever not calling finishDraw.

Bug: 253536483

Signed-off-by: Bowen Li <libowen1@xiaomi.corp-partner.google.com>
Change-Id: I8d28ad2bfc077db6343e04d3f454cd06055f9b52
1 file changed