Create Daisy Patch SM variant

Create variant .h .cpp and pinperiphs.c files
Use daisy seed linker script for patch sm
Add variant to boards.txt
Add Patch SM with link to README.md

Author: beserge

README.md

@@ -333,7 +333,8 @@ User can add a STM32 based board following this [wiki](https://github.com/stm32d
 | :green_heart: | STM32H747IG<br>STM32H747II | Generic Board | *2.0.0* |  |
 | :green_heart: | STM32H750ZB | Generic Board | *2.0.0* |  |
 | :green_heart: | STM32H750IB<br>STM32H750II | Generic Board | *2.0.0* |  |
-| :green_heart: | STM32H750IB | [Daisy ](https://www.electro-smith.com/daisy/daisy) | *1.9.0* |  |
+| :green_heart: | STM32H750IB | [Daisy](https://www.electro-smith.com/daisy/daisy) | *1.9.0* |  |
+| :yellow_heart: | STM32H750IB | [Daisy Patch SM](https://www.electro-smith.com/daisy/patch-sm) | *2.2.0* |  |
 | :green_heart: | STM32H750VB | Generic Board | *2.0.0* |  |
 | :green_heart: | STM32H753VI | Generic Board | *2.0.0* |  |
 | :green_heart: | STM32H753ZI | Generic Board | *2.0.0* |  |

boards.txt

@@ -3721,6 +3721,17 @@ GenH7.menu.pnum.DAISY_SEED.build.variant=STM32H7xx/H742I(G-I)(K-T)_H743I(G-I)(K-
 GenH7.menu.pnum.DAISY_SEED.build.peripheral_pins=-DCUSTOM_PERIPHERAL_PINS
 GenH7.menu.pnum.DAISY_SEED.build.ldscript=DAISY_SEED.ld
 
+# Daisy Patch SM board
+GenH7.menu.pnum.DAISY_PATCH_SM=Daisy Patch SM
+GenH7.menu.pnum.DAISY_PATCH_SM.upload.maximum_size=131072
+GenH7.menu.pnum.DAISY_PATCH_SM.upload.maximum_data_size=524288
+GenH7.menu.pnum.DAISY_PATCH_SM.build.board=DAISY_PATCH_SM
+GenH7.menu.pnum.DAISY_PATCH_SM.build.product_line=STM32H750xx
+GenH7.menu.pnum.DAISY_PATCH_SM.build.variant_h=variant_{build.board}.h
+GenH7.menu.pnum.DAISY_PATCH_SM.build.variant=STM32H7xx/H742I(G-I)(K-T)_H743I(G-I)(K-T)_H750IB(K-T)_H753II(K-T)
+GenH7.menu.pnum.DAISY_PATCH_SM.build.peripheral_pins=-DCUSTOM_PERIPHERAL_PINS
+GenH7.menu.pnum.DAISY_PATCH_SM.build.ldscript=DAISY_SEED.ld
+
 # Generic H742IGKx
 GenH7.menu.pnum.GENERIC_H742IGKX=Generic H742IGKx
 GenH7.menu.pnum.GENERIC_H742IGKX.upload.maximum_size=1048576