west: Add cmsis-dsp fix for shifting by negative amounts

This patch has been accepted upstream ARM-software/CMSIS-DSP#265.
The module PR, zephyrproject-rtos/cmsis-dsp#7 is pending review.

Signed-off-by: Keith Packard <keithp@keithp.com>

Author: keith-packard

west.yml

@@ -122,7 +122,7 @@ manifest:
       groups:
         - hal
     - name: cmsis-dsp
-      revision: 2c014e93d75c4896df57f072b3f7d5d06e37f254
+      revision: pull/7/head
       path: modules/lib/cmsis-dsp
     - name: cmsis-nn
       revision: e9328d612ea3ea7d0d210d3ac16ea8667c01abdd