Musca-S1 is a Cortex-M33 based SoC. It's similar to the
Musca-B1, but among other things the embedded flash has
been replaced with embedded MRAM (eMRAM) memory.
The Musca-S1 files have been created based on the Musca-B1
SoC and board files.
Add the Musca-S1 board to the list of allowed platforms
for the TF-M integration examples.
Change-Id: I4f517d28d0a5b8c4a3fc3fab73adb5519acfc3c2
Signed-off-by: David Vincze <david.vincze@linaro.org>