target-arm queue:

 * docs/devel/docs: Document .hx file syntax
 * arm_pamax() no longer needs to do feature propagation
 * docs/system/arm/virt.rst: Improve 'highmem' option docs
 * STM32L4x5 Implement SYSCFG and EXTI devices
 * hw/timer: fix systick trace message
 * hw/arm/virt: Consolidate valid CPU types
 * load_elf: fix iterator's type for elf file processing
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