runHWTests: fix adrv9371 procedure-name filter typo

The `zynq-zc706-adv7511-adrv9371` (and friends) case in `runHWTests.m`
set `at = 'AD9371Tests'`, but `at` is used as a substring filter against
test procedure names — which are `testAD9371Rx`, `testAD9371Obs`, etc.
(no "AD9371Tests" substring). Result: the filter matched zero
procedures and `runHWTests('zynq-zc706-adv7511-adrv9371')` ran zero
tests silently.

Match the convention used by the other branches (`AD9361`, `ADRV9002`,
`ADRV9009`, ...) by using the device-family substring `'AD9371'`.

Surfaced while running adi-lg-matlab end-to-end against the bq place
(zc706 + adrv9371) on the live coordinator.

Author: tfcollins

test/runHWTests.m

@@ -46,7 +46,7 @@ function runHWTests(board)
     case {"socfpga_arria10_socdk_adrv9371", ...
             "zynqmp-zcu102-rev10-adrv9371", ...
             "zynq-zc706-adv7511-adrv9371"}
-        at = 'AD9371Tests';
+        at = 'AD9371';
     case {"zynq-zed-adv7511-adrv9002-vcmos", ...
         "zynq-zed-adv7511-adrv9002-rx2tx2-vcmos", ...
         "zynqmp-zcu102-rev10-adrv9002-vcmos", ...