[2.0.x] Fix ambiguous function call (SERIAL_PROTOCOL_F) when using Arduino_Core_STM32

[ktand]

Description

When building for STM32 using the Arduino_Core_STM32 the compiler returns the following error:

In file included from ...\src\inc\marlinconfig.h:45:0,

                 from ...\src\feature\bedlevel\bedlevel.cpp:23:

...\src\feature\bedlevel\bedlevel.cpp: In function 'void print_2d_array(uint8_t, uint8_t, uint8_t, element_2d_fn)':

...\src\core\serial.h:137:58: error: call of overloaded 'print(const float&, const uint8_t&)' is ambiguous

   #define SERIAL_PROTOCOL_F(x,y)      MYSERIAL0.print(x,y)
                                                          
...\src\feature\bedlevel\bedlevel.cpp:236:11: note: in expansion of macro 'SERIAL_PROTOCOL_F'

           SERIAL_PROTOCOL_F(offset, precision);