Add Malaysia LoRa presets

[ndoo]

Malaysia has 2 valid regions:

1. 33cm band (ISM, for general use i.e. unlicensed users) - I suggest to just name this "Malaysia".

919 - 923 Mhz at 500mW, no restrictions.
923 - 924 MHz at 500mW with 1% duty cycle OR frequency hopping.
Frequency hopping is used for 919 - 923 MHz.

https://www.mcmc.gov.my/skmmgovmy/media/General/pdf/Short-Range-Devices-Specification.pdf

2. 70cm band (Amateur licensed users only) - I suggest to name this "Malaysia 433 MHz" or something similar to differentiate it.

433 - 435 MHz at 100mW, no restrictions.
https://www.mcmc.gov.my/skmmgovmy/media/General/pdf/Short-Range-Devices-Specification.pdf