efi_loader: __cyg_profile_func_enter/_exit
U-Boot can be compiled with function tracing enabled.
When compiling with FTRACE __cyg_profile_func_enter() is called when a
function is entered and __cyg_profile_func_exit() when the function is
left.
To avoid a crash we have to define these function for the free-standing
UEFI binaries.
Signed-off-by: NHeinrich Schuchardt <xypron.glpk@gmx.de>
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