stm32/eth_phy: Fix typo in header guard macro.

Typo on line 29 (PYH instead of PHY).

Compilation failing, here is the output:

    eth_phy.h:28: error: header guard 'MICROPY_INCLUDED_STM32_PHY_H'
    followed by '#define' of a different macro [Werror=header-guard]
        28 | #ifndef MICROPY_INCLUDED_STM32_PHY_H
    eth_phy.h:29: note: 'MICROPY_INCLUDED_STM32_PYH_H' is defined here;
    did you mean 'MICROPY_INCLUDED_STM32_PHY_H'?
        29 | #define MICROPY_INCLUDED_STM32_PYH_H

Signed-off-by: Tico06 <[email protected]>

Author: Tico06

ports/stm32/eth_phy.h

@@ -26,7 +26,7 @@
  */
 
 #ifndef MICROPY_INCLUDED_STM32_PHY_H
-#define MICROPY_INCLUDED_STM32_PYH_H
+#define MICROPY_INCLUDED_STM32_PHY_H
 
 #if defined(MICROPY_HW_ETH_MDC)