thermal/drivers/qcom: Add support for Qualcomm MBG thermal monitoring

Add a driver for the Qualcomm MBG (Master Bandgap) thermal monitoring
device. It monitors PMIC die temperature in hardware and raises an
interrupt when a programmed threshold is crossed.

MBG hardware supports two upper-threshold levels. Currently, only the
level-1 threshold is supported by the driver.

Temperature is read from the associated ADC channel, and when a level-1
upper-threshold violation occurs, the hardware generates an interrupt
over SPMI. The driver notifies the thermal framework accordingly.

Signed-off-by: Satya Priya Kakitapalli <quic_skakitap@quicinc.com>
Co-developed-by: Sachin Gupta <sachin.gupta@oss.qualcomm.com>
Signed-off-by: Sachin Gupta <sachin.gupta@oss.qualcomm.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://patch.msgid.link/20260722-spmi-mbg-driver-v3-2-ef73064f2789@oss.qualcomm.com

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