Added target STM32H7B3xx and specific target stm32h7b3zitx

- Fixed ram size for target H7B3
- Fixed flash size
  Sectory size for STM32H3B0xx is 32kbyte but for
  STM32H7B3xx 8kbyte
- Fixed fragments from patch integration

Resolves pyocd#1721

pyocd/target/builtin/target_STM32H7B3xx.py

@@ -45,6 +45,7 @@ class DBGMCU:
 FLASH_ALGO = {
     'load_address' : 0x20000000,
 
+    # Flash algorithm as a hex string
     # Flash algorithm as a hex string
     'instructions': [
     0xe7fdbe00,
@@ -66,7 +67,7 @@ class DBGMCU:
     0x010cf8c3, 0x3808487b, 0xf1a26800, 0x24040380, 0x1383ea44, 0x4b744318, 0x010cf8c3, 0xf8d04618,
     0xf040010c, 0xf8c30020, 0xbf00010c, 0x1f004871, 0xf0006800, 0x28000004, 0x486ed1f8, 0x68003808,
     0x0004f020, 0xf8c34b68, 0x486a010c, 0xe0001f00, 0x6800e005, 0x0001f000, 0x2001b108, 0xf7ffe7ba,
-    0x2000fee7, 0xb5f0e7b6, 0x46164603, 0x4635461a, 0xbf002400, 0x6pyocd/target/builtin/target_STM32H7B2xx.py900485c, 0x0001f000, 0xd1f92800,
+    0x2000fee7, 0xb5f0e7b6, 0x46164603, 0x4635461a, 0xbf002400, 0x6900485c, 0x0001f000, 0xd1f92800,
     0x4f594858, 0xbf006178, 0x1f00485a, 0xf0006800, 0x28000001, 0x4853d1f8, 0x60384f56, 0x4852e09c,
     0xf02068c0, 0x4f500001, 0x463860f8, 0xf04068c0, 0x60f80002, 0x3808484f, 0xf0206800, 0xf8c70001,
     0x4638010c, 0x010cf8d0, 0x0002f040, 0x010cf8c7, 0xd30c2910, 0xe0062400, 0x6868682f, 0x60506017,