tee: QCOMTEE should depend on ARCH_QCOM

The Qualcomm Trusted Execution Environment (QTEE) is only available on
Qualcomm SoCs.  Hence add a dependency on ARCH_QCOM, to prevent asking
the user about this driver when configuring a kernel without Qualcomm
platform support.

Fixes: d6e29083 ("tee: add Qualcomm TEE driver")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>