qemu-check.exp: increase timeout from 480 to 900 seconds

The default timeout is insufficient to run the full xtest suite
(regression+gp+pkcs11) with pager enabled (CFG_WITH_PAGER=y) on QEMU.
Increase it to 15 minutes.

Signed-off-by: Jerome Forissier <jerome@forissier.org>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
diff --git a/qemu-check.exp b/qemu-check.exp
index e61d519..b16cf4d 100644
--- a/qemu-check.exp
+++ b/qemu-check.exp
@@ -15,7 +15,9 @@
 # The time required to run some tests (e.g., key generation tests [4007.*])
 # can be significant and vary widely -- typically, from about one minute to
 # several minutes depending on the host machine.
-set timeout 480
+# The value here should be sufficient to run the whole optee_test suite
+# ('xtest') with all testsuites enabled (regression+gp+pkcs11).
+set timeout 900
 
 # Parse command line
 set myargs $argv