firmware: qcom: scm: Allow QSEECOM on PURWA-IOT-EVK

firmware: qcom: scm: Allow QSEECOM on PURWA-IOT-EVK

Add the Purwa-IoT-EVK board to the list to enable access to EFI variables.

Guarantee that subsystems relying on SCM services can access secure-world
features. This change improves reliability and prevents missing
functionality or boot-time issues by making service availability explicit.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Yijie Yang <yijie.yang@oss.qualcomm.com>
Reviewed-by: Abel Vesa <abel.vesa@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260202073555.1345260-2-yijie.yang@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>