media: gpio-ir-tx: improve precision of transmitted signal due to scheduling

media: gpio-ir-tx: improve precision of transmitted signal due to scheduling

[ Upstream commit ea8912b788f8144e7d32ee61e5ccba45424bef83 ]

usleep_range() may take longer than the max argument due to scheduling,
especially under load. This is causing random errors in the transmitted
IR. Remove the usleep_range() in favour of busy-looping with udelay().

Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>