Platform: Move Musca-B1 port up by 1 directory

As the Musca-B1 Secure Enclave port was removed there is no need for an
additional subdirectory for the main Musca-B1 port.

Signed-off-by: Mark Horvath <mark.horvath@arm.com>
Change-Id: Ie55deae37cb95de1ddc8569fe57f7ad9f97371bf
84 files changed