Revert "adb: Lower EP_ALLOC retry count"

This reverts commit 05fe272a.

Commit "adb: Do not signal gaget stack unless descriptors are written"
fixed the main issue for configfs devices where device wasn't enabled
until after the ioctl was attempted. Thus it is safe to bring up the
retry count so that the ioctl doesn't fail due to small delays in
usb stack.

Test: use adb, switch configs on configfs devices