Add hcd driver for frdm kl25z

[kkitayam]

Describe the PR
Add a HCD driver for NXP FRDM-KL25Z.
The HCD driver works with only HCD class.

Additional context
In order to operate as a USB host function, J21 must be shorted. The schematic is shown below.

This PR was tested on cdc_msc_hid example with a low speed mouse(Logitech M-UB48) and a full speed mouse(Logitech G403).

When running with a HUB, some patches are needed to make buffers align 4 byte boundary and to make buffer length be in 4 byte unit. It seems that KL25Z's USB IP(ChipIdea Fullspeed OTG core) writes data into memory in 4 byte unit.

Current HUB class driver requests IN transfer with the following buffers. The buffers needs patches.

tinyusb/src/host/hub.c

Line 43 in ffb257a

uint8_t status_change; // data from status change interrupt endpoint

tinyusb/src/host/hub.c

Line 45 in ffb257a

hub_port_status_response_t port_status;

tinyusb/src/host/hub.c

Line 49 in ffb257a

CFG_TUSB_MEM_SECTION TU_ATTR_ALIGNED(4) static uint8_t _hub_buffer[sizeof(descriptor_hub_desc_t)];

After the patches are applied, the HCD driver works with a pair of a full speed hub and a full speed mouse. However it does not work with a pair of a full speed hub and a low speed mouse. A bus turnaround timeout error will be occurred.

[hathach]

Thank you @kkitayam for another excellent PR. I am currently on TET (Lunar New Year) holiday. I will check this out as soon as I could.

[hathach]

thank you very much for your PR. I was putting my KL25z on soldering table, then realize that it is rev D and does not feature the J21 and R82 to test out the host functionality. I will try to test this later on with a newer/better board later on. For now, I fully rely on your testing.