Fix Float size for light-tasking-rtp on x86

TN: U126-004
Change-Id: I311f4fef0775a72b00de238eb4abd41d8f632882
(cherry picked from commit 65b5123)

Author: jklmnn

src/system/system-vxworks7-x86-ravenscar-sfp-rtp.ads

@@ -78,8 +78,8 @@ package System is
    Max_Binary_Modulus    : constant := 2 ** Standard'Max_Integer_Size;
    Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
 
-   Max_Base_Digits       : constant := Long_Long_Float'Digits;
-   Max_Digits            : constant := Long_Long_Float'Digits;
+   Max_Base_Digits       : constant := Long_Float'Digits;
+   Max_Digits            : constant := Long_Float'Digits;
 
    Max_Mantissa          : constant := Standard'Max_Integer_Size - 1;
    Fine_Delta            : constant := 2.0 ** (-Max_Mantissa);