ARM: dts: msm: Modify BDF to SID mapping for MBB on sdxlemur

Switch downstream BDF 0x208 is not used for enumeration. This
causes downstream bus number assignments to get changed. Hence
update BDF to SID table to reflect the same. Also update CPE SIDs
to lower case from upper case.

Change-Id: I0b5428021637c5c8255fead663a1c8e45fe1815b