msm: qpsp6v2: Makefile change to build adsp_loader

Bug: 8204207

Change-Id: Ie07c245364ae9d1b7c41c4c5a3b6f88ef14f51b7
Signed-off-by: Alexy Joseph <alexyj@codeaurora.org>
Signed-off-by: Mekala Natarajan <mekalan@codeaurora.org>
Signed-off-by: Ed Tam <etam@google.com>