scripts/dtc: Call pkg-config POSIXly correct

scripts/dtc: Call pkg-config POSIXly correct

BugLink: https://bugs.launchpad.net/bugs/1969110
[ Upstream commit a8b309ce9760943486e0585285e0125588a31650 ]

Running with POSIXLY_CORRECT=1 in the environment the scripts/dtc build
fails, because pkg-config doesn't output anything when the flags come
after the arguments.

Fixes: 067c650c456e ("dtc: Use pkg-config to locate libyaml")
Signed-off-by: Thomas Bracht Laumann Jespersen <t@laumann.xyz>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220131112028.7907-1-t@laumann.xyz
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 34bed8dae12a9090f252055c328f36e0d0ff1f71)
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>