Refactor QEMU_PIPE_RETRY

We already have qemu_pipe_try_again defined,
we want to use it in QEMU_PIPE_RETRY
instead of separate checks of errno.

Bug: 154346346
Test: build, boot
Signed-off-by: Roman Kiryanov <rkir@google.com>
Merged-In: Ie7e81400b5dd4188ead07d8c585f1100d9c6be83
Change-Id: Idf9708abb7a9874a80d55cca8c7068bc170bb821
3 files changed