regulators: Increase timeout for validator tests

The phosphor-regulators-tests executable currently has a timeout of 90
seconds.  This is due to the testcases for the Python config file
validation tool.  These testcases run the validation tool many times.
The test executable can take 30-60 seconds to run, especially under
valgrind.

I experienced a CI failure today because the executable took more than
90 seconds to run.  This could be related to the recent move to python3.

Increased the timeout to 120 seconds.

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: I94e2a70da71332563928913c8cd96237dea409b3
diff --git a/phosphor-regulators/test/meson.build b/phosphor-regulators/test/meson.build
index 0c2ba50..c1bec64 100644
--- a/phosphor-regulators/test/meson.build
+++ b/phosphor-regulators/test/meson.build
@@ -57,5 +57,5 @@
                     libi2c_dev_mock_inc
                 ]
      ),
-     timeout : 90
+     timeout : 120
 )