defconfig: sdxlemur: Enable nodump support for sdxlemur

Enable POWER_RESET_QCOM_DOWNLOAD_MODE_NODUMP for sdxlemur so that
on a warm-restart, user can choose to set nodump as download mode.

Change-Id: Icc600c2c45a266a56df890c16f1d32fd7a7eb98c
Signed-off-by: Khaja Hussain Shaik Khaji <quic_kshaikkh@quicinc.com>