Fix pgm_read_float() macro definitions (#5666)

Add in missing derefeence in pgm_read_float macro which was causing
compile errors.

Author: earlephilhower

tools/sdk/libc/xtensa-lx106-elf/include/sys/pgmspace.h

@@ -72,11 +72,11 @@ static inline uint16_t pgm_read_word_inlined(const void* addr) {
 #define pgm_read_word(addr)             pgm_read_word_inlined(addr)
 #ifdef __cplusplus
     #define pgm_read_dword(addr)            (*reinterpret_cast<const uint32_t*>(addr))
-    #define pgm_read_float(addr)            (*reinterpret_cast<const float>(addr))
+    #define pgm_read_float(addr)            (*reinterpret_cast<const float*>(addr))
     #define pgm_read_ptr(addr)              (*reinterpret_cast<const void*>(addr))
 #else
     #define pgm_read_dword(addr)            (*(const uint32_t*)(addr))
-    #define pgm_read_float(addr)            (*(const float)(addr))
+    #define pgm_read_float(addr)            (*(const float*)(addr))
     #define pgm_read_ptr(addr)              (*(const void*)(addr))
 #endif