This change fixes the problem with K64F Ethernet support where after transmitting frames, the buffers were not released so system would eventually running out of memory.

Signed-off-by: unknown <sersca01@SERSCA01-002137.usa.Arm.com>
[NUCLEO_F030R8] Correct PA_7 pwm channel number
Merge pull request #303 from bco2stm/master

[NUCLEO_F030R8] Correct PA_7 pwm channel number
[NUCLEO_F302R8] Correct the pin used for the LEDx definitions
fix uart tx isr detach
Merge pull request #305 from mazgch/master

[K64F] fix uart tx isr detach
Merge pull request #304 from bco2stm/master

[NUCLEO_F302R8] Correct the pin used for the LEDx definitions
Add new ST target TARGET_NUCLEO_L053R8 to few tests